#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mosquitto.h>
#include <mosquitto_broker.h>
#include <mosquitto_plugin.h>

static int handle_publish(int event, void *event_data, void *user_data);

static mosquitto_plugin_id_t *plg_id;

MOSQUITTO_PLUGIN_DECLARE_VERSION(5);

int mosquitto_plugin_init(mosquitto_plugin_id_t *identifier, void **user_data, struct mosquitto_opt *auth_opts, int auth_opt_count)
{
	(void)user_data;
	(void)auth_opts;
	(void)auth_opt_count;

	plg_id = identifier;

	mosquitto_callback_register(plg_id, MOSQ_EVT_MESSAGE, handle_publish, NULL, NULL);

	return MOSQ_ERR_SUCCESS;
}

int mosquitto_plugin_cleanup(void *user_data, struct mosquitto_opt *auth_opts, int auth_opt_count)
{
	(void)user_data;
	(void)auth_opts;
	(void)auth_opt_count;

	mosquitto_callback_unregister(plg_id, MOSQ_EVT_MESSAGE, handle_publish, NULL);

	return MOSQ_ERR_SUCCESS;
}

int handle_publish(int event, void *event_data, void *user_data)
{
	struct mosquitto_evt_message *ed = event_data;

	(void)user_data;

	if(event != MOSQ_EVT_MESSAGE){
		abort();
	}
	mosquitto_free(ed->topic);
	ed->topic = mosquitto_strdup("fixed-topic");
	return MOSQ_ERR_SUCCESS;
}